Adjust docs

Author: tzolov

README.adoc

@@ -12,12 +12,6 @@ You can build the entire site by invoking the following on the docs-build branch
 
 [source,bash]
 ----
-mvn exec:exec@antora
+./mvnw antora
 ----
 
-== Building a Specific Branch
-
-[source,bash]
-----
-mvn exec:exec@antora
-----

pom.xml

@@ -40,7 +40,6 @@
 						<option>--fetch</option>
 					</options>					
 					<packages>
-						<package>@antora/cli@3.2.0-alpha.6</package>
 						<package>@antora/atlas-extension@1.0.0-alpha.2</package>
 						<package>@antora/collector-extension@1.0.0-beta.1</package>
 						<package>@asciidoctor/tabs@1.0.0-beta.6</package>